Condenser



1934- P. G. JACOBSON 1,980,485

CONDENSER Filed June 18, 1930 2 Sheets-Sheet l Pe/r 6. JcaJsoiz- Nov. 13, 1934. P. G. JACOBSON 1,980,485

CONDENSER Filed June 18, 1950 2 Sheets-Sheet 2 v i A I 52 6? 1316271151 ffe; 67/0210 9022 Patented Nov. F3, 1934 UNETEE $A$ES lwillh fi (UQNDEN Peter G. Jacobson, Chicago, lillt, assignor to lite liance Die a Stamping (6a., Chicago, illt, a

corporation of illinois Application .l'une 18, 1934 Serial No. 262,4935

The invention is here shown as embodied in a condenser comprising a plurality of similar condenser units assembled in a single apparatus for simultaneous adjustment by means of of the turning dials in a radio set. A single grounded supporting frame supports the various stat elements of the condensers, and a rotary shaft journaled in the frame carries the rotor units or plates of the several condensers.

The principal object of this invention is to.

provide the improved mechanism for assembling, adjusting and operating the condenser, disclosed and claimed in the specifications whi h i'ollow.

Another object is to provide an improved meth-- ed and means for securing the rotor plates to rotary shaft.

Another object is to provide an improved means for spacing the rotor plates properly assernbled parallel relation. I

Another object is to provide improved means for supporting and spacing the stator plates.

.niother object is to provide improved for mounting slip-rings the rotatable shat.

Another object is to provide improved for grounding the rotatable to the tr nce and for applying adjustable or to the shaft.

Another object is to provide an improved trirnrner or for making a small ad justment or correction in the capacity of each condenser unit.

Other objects and advantages of this invention will be more apparent from the following detailed description of one approved form of apparatus embodying the principles of this invention.

In the accompanying drawings:

Fig. 1 is a plan view of a portion of denser assembly.

Fig. 2 is a side elevation of the structure shown in Fig. 1.

Fig. 3 is a horizontal section taken substantially on the line 33 of Fig. 2.

Fig. e is a transverse vertical section, substantially on the line 4-4 of Fig. 2.

Fig. 5 is a transverse vertical section substantially on the line 5-5 of Fig. 2.

Fig. 6 is a transverse vertical section substantially on the line 6-6 of Fig. 2.

Fig. '7 is a detail longitudinal section substantially on the line 7'7 of Fig. 6.

Fig. 8 is a transverse vertical section, taken substantially on the line 88 of Fig. 2.

Fig. 9 is a detail longitudinal vertical section taken substantialy on the line 99 of Fig. 8.

the corn taken taken taken taken Fig. 10 is a perspective view of a portion of the plate supporting sleeve.

plates.

lg. 12 is a perspective view of one of the stator lates.

"he supporting frame is drawn integrally from a single rather heavy sheet of steel or other suitable metal, and comp es a bottom i, side walls 2, and end walls 3. inc end walls 3 xtend upwardly at l above the side walls 2 a :1 suitable bearings 5 are mounted in these "ne portions in which are journaled the ends of the rotatable 6. One reduced end portion or shaft indicated at 7. The other end portion of shaft 6 (not here shown) extends .rther beyond t framework and is adapted be secured to the actuating dia The condenser coi a1 similar partitions 12 of each partiti r n lower partition 3) downwardly projecting to. overlap partition 8 and riveted thereto indicated i The tubular sleeve 16 which ca:

s the rotor plates of the condensers is rabiy drawn or roile from suitable sheet metal, and is adapted to telescope snugly over the rotatable shaft 6. T e tube 18 is anchored in position on the shaft 6 by means of a pin 1'? passed transversely through the tube and shaft at some suitable point longitudinally thereof. One end of sleeve 16 has secured thereto a contact plate 18 of brass or other suitable metal, which forms an outstanding annular flange adapted to bear against the innor surface of the adjacent end bearing 5. The opposite end of tube or sleeve 16 bears against the inner surface of the bearing 5 at the other end of the assembly.

A plurality of separate condenser units are mounted, one in each compartment of the frame as divided by the partitions 8. In the present example, only one end unit and a portion of the next adjacent unit is shown.

Each condenser unit comprises a plurality (here shown by way of example as eight) of rotor condenser plates 19, one of which is shown detached in Fig. 11; Each plate 19 is of generally semi-circular contour, and is adapted to be attached to the rotatable sleeveat an eccentric or git-center point on its diametrical side, as usual in such structures. A projecting portion 20 has an outer semi-circular contour 21 corresponding to the circumference of tube 16. In this extension 20 is cut a downwardly converging wedge-shaped slot 22, having a central circular enlargement 23 of approximately the same diameter as shaft 6.

The outwardly projecting eccentric portion 24 of plate 19 is provided with a short fiat side 25 at the end remote from the center of rotation of the plate, from which flat side 25 projects a pair of tongues 26.v

The supporting tube or sleeve 16 is provided with a plurality of pairs of opposed slots 27 and 28, spaced at equal intervals longitudinally of the tube. In the present instance there will be eight of these pairs of slots to accommodate the eight rotor plates of each condenser assembly. The two slots 27 and 28 of each pair are positioned in substantially the same plane perpendicular to the axis of the shaft and tube, and each slot is of substantially thesame thickness as one of the plates 19. The slots 27 and 28 are cut through the opposite sides of the tubular sleeve but diverge from-one another at the same angle as the wedgeshaped recess 22 in plate 19. At the outer divergent ends of the several slots are formed enlarged openings 29, which may be conical or semi-spherical depressions drilled into the outer surface of the tube at the end of each slot. In the process of assembling the plates with the supporting tube, one of the plates 19 is slipped into a pair of slots 2'? and 28, from the convergent ends of the slots, the recess 22 being adapted to fit about the portions of the sleeve 16 remaining between the ends of the pair of slots. This assembled position is best shown in Fig. 8. It will be apparent that the enlarged circular portion 23 of recess 22 will now register with the cylindrical passage 30 in tube or sleeve 16, so that the shaft 6 may be'inserted through the assembled tube and plates. The projecting ends 31 of the extensions 20 of the plates 19 are now peened or upset into the enlarged openings 29 in sleeve 16 so as to rivet the plates in assembled relation with the tube or sleeve. It will be apparent that when the shaft 6 is inserted through the tube the plates will be further locked in position by the engagement of this shaft within the circular openings 23 in the severalplates.

In order to further hold the group of condenser plates 19 in proper spaced parallel relation, spacer plates 32 provided with openings or apertures formed to receive the tongues 26 are fitted against the flat outer ends 25 of the group of plates, and the outer ends of-tongues 26 are then upset or riveted as indicated at 33 so as to lock the spacing plates 32 upon the assembly of rotor plates.

A spring contact member 34 of copper or other suitable metal, is anchored at its lower end 35 in the adjacent end wall 3 of the frame, and the upper forked end 36 of this plate is adapted to bear against the inner surface of annular contact plate 18 on the end of tube 16. A screw 37 passes freely through an opening in the end wall 3 and is threaded at its inner end 38 into the spring arm 34., A coiled compression spring 39 is-confined around screw 37 between the head 40 of the screw and the adjacent outer surface of end wall 3 of the-frame. It will be apparent, that the compressed spring 394 will draw the forked upper end 36 of spring arm 34 into clamping engagement with the inner surface of contact plate 18, thus forcing this plate 18 against the adjacent end bearing 5. The force of this engagement may be adjusted by screwing in or out the adjusting screw 37. This clamping engagement of contact arm 34 against contact ring 18, and of the contact ring against the end bearing 5 serves to exert an adjustable brake or drag on the rotatable assembly, so as to frictionally hold the rotatable parts in any desired position. At the same time this connection serves to properly complete the electrical circuit between the adjacent condenser unit and the framework. Similar electrical connections are provided between each of the other condenser units and the adjacent partitions 8 which separate the frame into the several separate compartments. For this purpose shallow annular channels 41 are formed in tube 16 (one for each condenser unit and adjacent each partition) and in this channel is seated a slip-ring 42, preferably "formed of a strip of copper or other suitable metal coiled into the channel. This slip ring is anchored in place by rolling a groove 43 into the metal of the tube 16 adjacent each edge of channel 41, whereby the metal of the tube is rolled over the adjacent edge of the slip-ring 42. All of this is best shown in Fig. 7. A brushassembly cooperating with this slip-ring comprises a copper plate 44 riveted to the upper partition member at 45, and formed with a pair of downwardly projecting spring contact arms 46 which engage with the opposite sides of slipring 42. A projecting arm 47 at the upper end of plate 44 provides for the wiring connection.

Each condenser unit comprises a plurality of stator plates 48 (shown in perspective in Fig. 12)

inthe present example there being nine of these plates for each condenser unit, the plates being assembled in spaced parallel relation so that the eight plates of the rotor assembly may be inserted in inter-leaved relation with the stator plates, but out of contact therewith. Each stator plate 48 is formed in its upper edge with a recess 49 to provide clearance for the rotatable shaft, and is formed with projecting fingers or tongues 50 on its opposite ends. A sheet or block of insulating material 51 is riveted or otherwise secured at 52 to one of the side. walls 2 of the frame. A metallic supporting bracket 53 is bolted at its upper end as at 54 to the upper portion of insulating plate 51. The inwardly and downwardly projecting portion 55 0f supporting plate 53 is formed with a plurality of properly spaced openings to receive the tongues 50 at one end of the group of stator plates 48, these tongues being upset or riveted against the outer surface of plate 53 as indicated at 56.

A second vertically extending plate or block of insulating material 57 is riveted at its lower end as at 58 to the upstanding arm 59 of a rightangled supporting bracket,'the horizontal arm 60 of which is secured at 61'to the bottom 1 of the frame. A metallic supporting plate 62 is bolted at 63 to the upper portion of insulating plate 57, this supporting plate 62 being formed with a plurality of spaced openings for receiving the tongues 50 at the adjacent end of the group of stator plates 48, these tongues being riveted in place in the same manner as already described for the tongues at the opposite ends of the plates. Electrical connection with this stator portion of the condenser unit may be made by means of a bracket or contact member 64- held in place by one of the securing bolts 54 (see Fig. 1).

Each condenser unit is provided with a small auxiliary condenser or trimmer whereby a fine, fixed adjustment may be made.

A fixed plate is mounted on the upper outer side of insulating plate 57. A thin sheet 66 of mica or other insulating material is held in place by a ring or frame 67, the assembled plates or sheets 65, 66 and .67 being held in place by the bolts 63 already described for holding the supporting plate 62 of the mainstator plates. A contact bracket 68 held in place by one of the bolts 63 provides for a separate wiring connection to the stator plate 65. Openings 69 and '70 are made in the supporting plate 62 and stator plate 65 respectively, whereby an outwardly projecting supporting post '71 anchored at '72 in the insulating plate 5'7 will not have electrical connection with either of these plates. A small movable condenser plate '73 forms the inner flange of a spool '74 slidably supported on the post '71. The post '71 is interiorly threaded to receive a screw '75, the head '76 of which bears against the outer end of spool '74 so as to force the spool inwardly along the post as the screw '75 is advanced into the post. A spring contact arm '77 is anchored at its lower end '78 between the bracket 59 and the lower end of insulating plate 5'7, and the upper forked end '79 of this spring arm engages the inner flange of spool '74 and tends to force the spool outwardly along the post '71. It will now be apparent that the spring arm '77 will hold the spool against the head 76 of the screw. By merely turning the screw '75, the screw and spring arm will cooperate to minutely adjust the movable contact plate '73 toward or from the fixed contact plate 65. The thin insulating plate 66 prevents direct contact of the two plates 65 and '73. After the condenser has been assembled, the several individual condenser units may have their capacities properly balanced by applying a fixed adjustment to each of the several trimmers as just described.

The several parts described in detail hereinabove comprise, when assembled, a rigid and effective condenser which will not easily get out of proper adjustment, and will be durable and eiiicient. The several parts of the condenser are economically and quickly stamped and assembled, and no expensive machining operations are required.

I claim:

1. In a condenser, a rotatable shaft, a tubular sleeve adapted to be fitted about a portion of the shaft, there being a plurality of pairs of slots formed at intervals in the sleeve spaced longitudinally thereof, each pair of slots being positioned in the same plane perpendicular to the axis of the shaft and one at either side of the sleeve, the slots intersecting the cylindrical passage through the sleeve, there being enlarged openings formed at one pair of adjacent ends of each pair of slots, and a plurality of condenser plates, each plate being of substantially the same thickness as one of the slots, the plate being formed with a recess shaped to receive the portions of the sleeve remaining between the slots of a pair, this recess having a larger circular central portion to receive the shaft, the free edges oi the plate at the open end of the recess being upset into the openings to ri\ et the plate to the sleeve.

2. In a condenser, a rotatable shaft, a tubular sleeve adapted to be fitted about a portion of the shaft, there being a plurality of pairs of slots formed at intervals in the sleeve spaced longitudinally thereof, each pair of slots being positioned in the same plane perpendicular to the axis of the shaft and one at each side of the sleeve, the slots intersecting the cylindrical passage in the sleeve and diverging from one another whereby a wider portion of the sleeve remains between one pair of adjacent ends of the slots than remains between the other ends, there being enlarged openings formed in the outer surface or the tube at the divergent ends of the slots, and a plurality of condenser plates, each plate being of substantially the same thickness as one of the slots, the plate being formed with a substantially wedgeshaped recess to receive the portions of the tube remaining between the slots of a pair, the recess having an enlarged circular central portion to receive the shaft, the free edges of the plate at the larger open end of the recess being upset into the openings to rivet the plate to the sleeve.

3. In a condenser, a rotor element comprising a supporting shaft, there being a shallow annular channel formed in the shaft, a split slip-ring of conductive metal fitted in the channel, the edge portions of the shaft at the sides of the channel being rolled in over the edge portions of the slipring.

4. In a condenser, a rotor element comprising a supporting shaft, a tubular sleeve fitted about the shaft, a plurality of spaced apart condenser plates secured to the tube, there being a shallow annular channel formed in the tube, a split slipring of conductive metal fitted-into the channel, the edge portions of the tube at the sides of the channel being rolled in over the edge portions of the slip-ring.

5. In a condenser, a capacity adjustment comprising a fixed condenser plate, a supporting post positioned at right angles to the plate but insulated therefrom, a spool slidably mounted on the post, the inner flange of the spool forming a movable plate member, a spring contact member engaging a portion of the spool remote from the fixed plate and urging the spool away from the fixed plate, and a screw for adjustably forcing the spool toward the fixed plate against the force of the spring.

6. In a condenser, a capacity adjustment comprising a supporting block of insulating material, a fixed condenser plate mounted on the block, said plate having a central aperture therein, a supporting post mounted in the block and projecting centrally through the aperture without electrical contact with the plate, a plate member in the form of a spool slidably mounted on the post, a screw threaded into the end of the post for forcing the spool toward the fixed plate, and a contact member mounted on the insulating block and having a spring portion engaging the spool to urge same away from the fixed plate.

'7. In a condenser, a capacity adjustment comprising a supporting block of insulating material, a fixed condenser plate mounted on the block, said plate having a central aperture therein, a supporting post mounted in the block and projecting centrally through the aperture without electrical contact with the plate, a plate member in the form of a spool slidably mounted on the post, a thin sheet of insulating material mounted over the exposed face of the fixed plate to prevent actual contact of the condenser members, a screw threaded into the end of the post for forcing the spool toward the fixed plate, and a contact member mounted on the insulating block and having a spring portion engaging the spool to urge the same away from the fixed plate.

FETER G. JACOBSON. 

